Adjustable limit gauge



L. E. oLsEN.

ADJUSTABLE LIMIT GAUGE.

APPLICATION FILED IuLY 26.1920.

lplo Patented May 2, 1922.

YI rmmcp 93'* (IL, ma

ASSIGNF T t; WHITE I ADJUSTABLE Lllii''' GAUtl'E.

Specication of Letters Patent.

parentesi/ my e, ieee.

Application med July 26, 1920. Serial No. 393,902.

.71' 'o ait' whom-.t may concern.'

lrnown that i, LAWRENCE E. ULSEN, a citizen of the United States,'residing at Trey, in the county of Rensselaer and State of New York,have invented certain new and useful improvements in Adjustable LimitGauges, of which the following is a specification.

This invention relates to a linear gauge and in particular to a gaugeadapted to be used to determine the dimensions of cylindrical holes orother internal dimensions. A gauge of the type to which the inventionrelates .may be accuratey adjusted to a standard dimension and also toa'dimension slightly different from the standard dimension. A gauge ofthis type is covered by my cope'nding application for adjustable limitgauges, Serial No. 398,901, filed on even date herewith.

@ne object of the invention is to provide a gauge of this type witheasily operated. rotatable means to change the distance betweenl thecontact pins' of the gauge from the standard dimension to a' dimensionslightly different from the standard.

With this and other objects in view, my invention consists in thefeatures of construction a-nd operation set forthl in the followingspecilicatioxi.

lt is to be understood that the present showing discloses but 4severaispecific constructions of' gauges made in accordance with the presentinvention and that other constructions differing fromV theseconstructions are included within .the spirity and scope of theinvention as expressed in the appended claims.

lny the drawing:

Figure 1 shows a longitudinal view of one embodiment of the presentinvention.

. Fig. 2 is another view partly in section of the construction shown inFig. 1.

Fig. 3 is an end view of the construction shown in Figs. 1 and'2.

Fig. 4c is an enlarged view in section of i the sleeve taken on the line4-4 of Fig. 2.

ln the drawing, l have illustrated only a gauge adapted for determininginternal dimensions for the reason that the'invention is particularlyapplicable to gauges of this type, but it is to be understood that asconcerns certain of its features, the invention is not so limited. Agauge embodyingthe invention comprises a frame and two opposed contactpms at opposite ends of the frame` one pin being freely movablelongitudinally 'through a definite predetermined distance and the otherpin preferably being longitudinally adjustable.

Referring more in detail to the drawing, 10 represents the gauge frameand 11 and 12 represent the two Contact pins. `When the gauge isintended for determining internal dimensions, the frame extends directlyalong straight lines from one pinto 'a bushing 17 and forces itintovclamping Contact with the pin.

The pin 12 is freely movable longitudinally and carried by the frame isa manually operable means for controlling or e'ecting the movement ofthe pin. -The pin 12 is mounted in hole 19 formed inthe frame, this holebeing closed by an apertured cap 20. This cap 20 is preferably securedrigidly in position by means of a plurality of screws 20a as shown inFig. 3. A spring 21 is interposed between the cap 2O and a collar on thepin, this spring serving to force the pin inward.

The means for moving the pin 12 is constructed and positioned asfollows: A cylindrical hole 35 is formed in the frame, this hole beingcounterbored as shown at' 36. Rotatably mounted within the hole 35 is asleeve 37 having a head 38 which takes up against one side of the frame10. At thev opposite end of the sleeve 38 is a head 39 which fits intothe' counterbore 36 and engages the sleeve at 40. A screw 41 is formedon the head 39 and extends through the sleeve 37 and is engaged at theother end by av nut 42. rlhis screw. and nut serve to hold the head andsleeve in engagement with each other. Carried by the head 39 is a handleextent correspondiin 48 whereby the head and the sleeve may be readilyturned. As shown most clearly `in Fig. l4, the sleeve 37 is formed witha plurality (preferably three or more) 0f fragmentary concentriccylindrical surfaces 44, 45, 46, 47, 48 and 49 of different radii, thesesurfaces being connected ,by short eccentric cam surfaces 50; The innerend of the pin 12 engages one or another of the cylindrical surfaces ofthe sleeve and it will be seen that when the sleeve is turned the' pinis moved inward or outward through a definite distance from one definiteposition to another definite position. The surfaces 44 to 49 serve asstops for determining the limits of movement of the pin. The distancesof movement between each two adjacent surfaces are different, theypreferably being successively less as the sleeve is turned or adjusted.For instance, the distance between the-surfacesy 44 and 45 may be ivethousandths of'an inch; between the sur-l faces 45 and 46, fourthousandths, etc. Thus by moving the sleeve in opposite directions sothat the p in is engaged by the surfaces44 and 45 the pin is moved to anto a certain predetermined tolerance. y adjusting the sleeve so that thepin is engaged by other surfaces, as, for instance, the surfaces 47 and48, a lesser movement is effected which corresponds to a lesserpredetermined tolerance.

1n order that the operator may conveniently move the sleeve and limitthe movement so that the pin will cooperate with only two surfaces, 1provide an adjustable stop mechanism' which includes a screw,

which may described. As illustrated, there is a stop pin 51 whichprojects into a notch 52 formed in the head 39. 1t will be clear thatthis pin engagingthe sides of the notch limits the turnin movement ofthe head and ofl the sleeve. y loosening the nut 42 on the screw 41 thesleeve may be turned with respect to the head, thus making it possibleto bring any two of the surfaces 44 to 49 into operative relation withthe pin 12. Then by tightening the nut on the screw the stop is againmade operative in a new relative position.

1t will be seen that in accordance with my invention, 1 have provided alimit gauge in which al single pin at one end of the gauge is movableinto rtwo different and distinct positions corresponding respectively tothe-maximum and minimum permissible dimensions. The first position isthe not go position andthe second position is the go position. A gaugeof this type has distinct advantages over a gauge having two fixed pinsat definite positions. Clearly if there were two such fixed pins, thenot go pin would preventthe go pin from entering into a hole except fora certain be the screw 41 alreadyy very limited distance;V but with myimv proved gauge the diameter or dimension 'of Acomprising 1ncombination, a frame, a contact pin at one end ofl-the frame, a contactpin at ,the other end of the frame and movable inward or outward withrespect thereto, means for moving the movable pin comprising an elementrotatable about an axis perpendicular to the said pin. and havingan'eccentric cam surface engaging the pin, and means associated with thesaid moving means for limiting the said movement of the pin.

2. A gauge for determining dimensions soV comprising in combinatiom aframe, a contact pin at one end of the frame, a contact pin at the otherend of the frame 4and movable inward or outward with respect thereto,two stops for determining the limits of movement of the movable pin,means for `moving the said pin from one limit position to the othercomprising anelement rotatable about an axis perpendicularto the saidpin and having an eccentric cam surface engaging the pin.

3. A gauge for determining dimensions comprising in combination, aframe, a contact pin at one end of the frame, ia contact pin at theother' end of the frame and mov-- vable inward or outward with respectthereto, means for moving the movable pin comprising an elementrotatable about an axis perpendicular to the said pin and having anIeccentric cam surface engaging the pin, and means associated with thesaid rotatable element for limiting the rotative movement thereof.' t

4. A gauge forvdetermining dimensions comprising in combination, aframe, a contact pin at one end of the frame, a contact pin projectinout-ward at the other end of the frame an movable inward or outward withrespect thereto, means for moving the last said pin comprising anelement rotatable about an axis perpendicular to the said pin and inengagement therewith, the said element havin a plurality of ,segmentalcylindrical sur aces -concentric with the axis of rotation and ofdifferent radii and also having one or more eccentric camsurfacesconnecting the cylindrical surfaces.

5. A gauge for, determining dimensions comprising 1n combination, aframe, a contact pin at one end of the frame, a contact pin projectingoutward at the other'end of the frame 'and movable inward or outwardwith respect thereto, means for moving the last said pin comprising anelement rotatable about an axis perpendicular to the Said adjacentsurfaces.

6. A gauge for determmlng dlmenslons comprising in combination, a rame,a contact pin at one end of the frame, a contact pin projecting outwardat the other end of vthe frame and movable inward or outward withrespect thereto,'means for moving the last said pin comprising anelement rotatable about an axis perpendicular to the said pin and inengagement therewith, the said element havin three or more segmentalcylindrical sur aces concentric with the axis of rotation and ofdifferent radii and also having one or more eccentric cam surfacesconnecting the cylindrical surfaces, means for limiting the rotativemovement of the rotatable element so that only two adjacent cylindricalsurfaces can be engaged with the pin, and means for adjusting the stopto vary the limits of rotative movement so that any two adjacentcylindrical surfaces can be. engaged.

A gauge for determining dimensions comprising 1n combination, a frame, acontact pin at one end of the frame, a contact pin projecting outward atthe other end of the frame and movable inward or outward with respectthereto, means for moving the last said pin comprising an elementrotatable about an axis perpendicular to the said pin'and in engagementtherewith, the said element having three or more segmental cylindricalsurfaces concentric with the axis of rotation and of dierent radii andalso having one or more eccentric cam surfaces connecting thecylindrical surfaces, a notched head connected with the rotatableelement, a pin entering the notch and serving to limit the movement ofthe head and of the rotatable element so that only two.

adjacent cylindrical surfaces can be engaged with the pin, and meanswhereby the rotatable element can be angularly adjusted with' respect tothe head so that any two adjacent cylindrical surfaces can be engaged.

8. A gauge for determining dimensions comprising 1n combination, aframe, a contact pin at one end of the frame,.means for adjusting thesaid pin inward or outward and locking it in adjusted position, a contact pin at the other end of the frame and movable inward or outwardwith respect thereto, means for moving the movable pin comprising anelement rotatable about an axis perpendicular to the said pin and havingan eccentric cam surface engaging the pin, and means associated with thesaid moving means for limiting the said movement of the pin.

9. A gauge for determining internal dimensions comprising incombination, a frame, a contact pin projecting outward at one end of theframe, a contact pin projecting outward at the other end of' the frameand movable inward or outward with respect thereto, the said frameextending directly along straight. lines 4from one pin to the other,means for moving the movable pin comprising an element rotatable aboutan axis perpendicular to the said pin and having an eccentric camsurface engaging the pin, and means associated with the said movingmeans for limiting the said movement of the pin.

10. A gauge for determining internal dimensions comprising incombination, a frame, a contact pin projecting outward at one end of theframe, means for adjusting the said pin inward or outward and locking itin adjusted position, a contact pin projecting outward at the other endof the frame and movable inward or outward with respect thereto, thesaid frame extending directly along straight lines from one pin to theother, means for moving the movable pin comprising an element rotatableabout an axis perpendicular to the saidl pin and having an eccentric camsurface engaging the pin, and means associated with the said movingmeans for limiting the said movement of the pin.

In test-imony whereof, I hereto aiiix my signature.

LAWRENCE E. OLSEN.

